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  <div class="section" id="creating-hydrator-applications-using-cdap-system-artifacts">
<span id="cdap-pipeline-guide"></span><h1>Creating Hydrator Applications using CDAP System Artifacts<a class="headerlink" href="#creating-hydrator-applications-using-cdap-system-artifacts" title="Permalink to this headline">🔗</a></h1>
<blockquote class="pull-quote">
<div><strong>Source Code Repository:</strong> Source code (and other resources) for this guide are available at the
<a class="reference external" href="https://github.com/cdap-guides/cdap-etl-guide/tree/develop">CDAP Guides GitHub repository</a>.</div></blockquote>
<p>Using the built-in <code class="docutils literal notranslate"><span class="pre">cdap-data-pipeline</span></code> and <code class="docutils literal notranslate"><span class="pre">cdap-data-streams</span></code> system artifacts, you can
create Cask Hydrator Pipelines (Hydrator Applications) with just a JSON configuration file. CDAP ships
with a set of built-in Sources, Sinks, Transforms, and other plugins (described <a class="reference external" href="http://docs.cdap.io/cdap/current/en/hydrator-manual/plugins/index.html">here</a>) which can be used
to create batch and real-time data pipeline applications right out of the box.</p>
<p>Note: If you want to create your own Source, Sink, or other plugin, you can find more
instructions on how to do that <a class="reference external" href="http://docs.cdap.io/cdap/current/en/hydrator-manual/developing-plugins/index.html">here</a>.</p>
<p><strong>Note:</strong> Both the <code class="docutils literal notranslate"><span class="pre">cdap-etl-batch</span></code> and <code class="docutils literal notranslate"><span class="pre">cdap-etl-realtime</span></code> system artifacts have been
deprecated as of CDAP 3.5.0 and replaced with the artifacts <code class="docutils literal notranslate"><span class="pre">cdap-data-pipeline</span></code> and
<code class="docutils literal notranslate"><span class="pre">cdap-data-streams</span></code> respectively.</p>
<div class="section" id="what-you-will-create">
<h2>What You Will Create<a class="headerlink" href="#what-you-will-create" title="Permalink to this headline">🔗</a></h2>
<ul class="simple">
<li><a class="reference external" href="https://github.com/cdap-guides/cdap-etl-guide/tree/develop/CDAPTableToDBTable"><strong>Batch CDAP HBase Table to Database Table:</strong></a> This application exports the contents of a CDAP HBase Table to a Database Table in Batch.</li>
</ul>
<ul class="simple">
<li><a class="reference external" href="https://github.com/cdap-guides/cdap-etl-guide/tree/develop/DBTableToCDAPTable"><strong>Batch Database Table to CDAP HBase Table:</strong></a> In this application, we will export the contents of a Database Table to a CDAP HBase table in Batch.</li>
</ul>
<ul class="simple">
<li><a class="reference external" href="https://github.com/cdap-guides/cdap-etl-guide/tree/develop/StreamToImpala"><strong>Batch CDAP Stream to Impala:</strong></a> This application makes the events ingested in a CDAP Stream queryable through Impala.</li>
</ul>
<ul class="simple">
<li><a class="reference external" href="https://github.com/cdap-guides/cdap-etl-guide/tree/develop/RealtimeJMSToStream"><strong>Real-time JMS to Stream:</strong></a> In this application, we will read messages from a JMS producer in real time and write to a CDAP Stream.</li>
</ul>
<ul class="simple">
<li><a class="reference external" href="https://github.com/cdap-guides/cdap-etl-guide/tree/develop/RealtimeKafkaToTPFSAvro"><strong>Real-time Kafka to TPFS Avro:</strong></a> This application fetches messages from Kafka in real time and writes to Time-PartitionedFileSets in Avro format.</li>
</ul>
<ul class="simple">
<li><a class="reference external" href="https://github.com/cdap-guides/cdap-etl-guide/tree/develop/RealtimeTwitterToHBase"><strong>Real-time Twitter to HBase:</strong></a> In this application, we will read Tweets from Twitter in real time and write to an HBase Table.</li>
</ul>
</div>
<div class="section" id="what-you-will-need">
<h2>What You Will Need<a class="headerlink" href="#what-you-will-need" title="Permalink to this headline">🔗</a></h2>
<ul class="simple">
<li><a class="reference external" href="http://www.oracle.com/technetwork/java/javase/downloads/index.html">JDK 7 or 8</a></li>
<li><a class="reference external" href="http://docs.cdap.io/cdap/current/en/developers-manual/getting-started/standalone/index.html">CDAP SDK</a></li>
</ul>
</div>
<div class="section" id="let-s-begin">
<h2>Let’s Begin!<a class="headerlink" href="#let-s-begin" title="Permalink to this headline">🔗</a></h2>
<p>For these guides, we will use the CDAP CLI to create and manage Hydrator Applications. The CLI
commands assume that the <code class="docutils literal notranslate"><span class="pre">cdap-cli.sh</span></code> script is available on your PATH. If this is not
the case, please add it:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> <span class="nb">export</span> <span class="nv">PATH</span><span class="o">=</span><span class="nv">$PATH</span>:&lt;CDAP home&gt;/bin
</pre></div>
</div>
<p>or, from within the &lt;CDAP home&gt; directory:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> <span class="nb">export</span> <span class="nv">PATH</span><span class="o">=</span><span class="si">${</span><span class="nv">PATH</span><span class="si">}</span>:<span class="sb">`</span><span class="nb">pwd</span><span class="sb">`</span>/bin
</pre></div>
</div>
<p>If you haven’t already started a standalone CDAP installation, start it with the command:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> cdap.sh start
</pre></div>
</div>
<p>Now navigate to the Hydrator Application that you want to create and you will find further
instructions on how to create that specific application.</p>
</div>
<div class="section" id="share-and-discuss">
<h2>Share and Discuss!<a class="headerlink" href="#share-and-discuss" title="Permalink to this headline">🔗</a></h2>
<p>Have a question? Discuss at the <a class="reference external" href="https://groups.google.com/forum/#!forum/cdap-user">CDAP User Mailing List</a>.</p>
</div>
<div class="section" id="license">
<h2>License<a class="headerlink" href="#license" title="Permalink to this headline">🔗</a></h2>
<p>Copyright © 2015-2016 Cask Data, Inc.</p>
<p>Licensed under the Apache License, Version 2.0 (the “License”); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at</p>
<p><a class="reference external" href="http://www.apache.org/licenses/LICENSE-2.0">http://www.apache.org/licenses/LICENSE-2.0</a></p>
<p>Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.</p>
</div>
</div>

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